1 files changed, 60 insertions, 0 deletions

diff --git a/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/util/Signed.java b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/util/Signed.java
new file mode 100644
index 00000000..8f8bc228
--- /dev/null
+++ b/subprojects/viatra-runtime-matchers/src/main/java/tools/refinery/viatra/runtime/matchers/util/Signed.java
@@ -0,0 +1,60 @@
+/*******************************************************************************
+ * Copyright (c) 2010-2019, Tamas Szabo, itemis AG, Gabor Bergmann, IncQuery Labs Ltd.
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v. 2.0 which is available at
+ * http://www.eclipse.org/legal/epl-v20.html.
+ * 
+ * SPDX-License-Identifier: EPL-2.0
+ *******************************************************************************/
+package tools.refinery.viatra.runtime.matchers.util;
+
+import java.util.Objects;
+
+/**
+ * A piece of data associated with a direction. 
+ * 
+ * @author Tamas Szabo
+ * @since 2.4
+ */
+public class Signed<Payload extends Comparable<Payload>> {
+
+    private final Payload payload;
+    private final Direction direction;
+
+    public Signed(final Direction direction, final Payload payload) {
+        this.payload = payload;
+        this.direction = direction;
+    }
+
+    public Payload getPayload() {
+        return payload;
+    }
+
+    public Direction getDirection() {
+        return direction;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(direction, payload);
+    }
+
+    @Override
+    public boolean equals(final Object obj) {
+        if (this == obj) {
+            return true;
+        } else if (obj == null || this.getClass() != obj.getClass()) {
+            return false;
+        } else {
+            @SuppressWarnings("rawtypes")
+            final Signed other = (Signed) obj;
+            return direction == other.direction && Objects.equals(payload, other.payload);
+        }
+    }
+
+    @Override
+    public String toString() {
+        return this.direction.asSign() + this.payload.toString();
+    }
+
+}
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